diff --git a/.gitignore b/.gitignore
index f71d7c2..0e0322f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -417,3 +417,6 @@ Temporary Items
 .apdisk
 __MACOSX/
 *.icloud
+
+# Build output
+/output/
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..10a4fb0
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")" && pwd)"
+OUTPUT_DIR="$ROOT/output"
+PROJECT="$ROOT/BadBuilder/BadBuilder.csproj"
+
+mkdir -p "$OUTPUT_DIR"
+
+publish() {
+  local rid="$1"
+  local name="$2"
+
+  echo "Publishing $name ($rid)..."
+  dotnet publish "$PROJECT" \
+    -c Release \
+    -r "$rid" \
+    -p:SelfContained=false \
+    -p:PublishSingleFile=true \
+    -o "$OUTPUT_DIR/tmp-$rid"
+
+  mv "$OUTPUT_DIR/tmp-$rid/BadBuilder.exe" "$OUTPUT_DIR/$name"
+  rm -rf "$OUTPUT_DIR/tmp-$rid"
+  echo "  -> $OUTPUT_DIR/$name"
+}
+
+publish "win-x64" "BadBuilder-AMD64.exe"
+publish "win-x86" "BadBuilder-x86.exe"
+publish "win-arm64" "BadBuilder-ARM64.exe"
+
+echo
+echo "Done. Binaries in $OUTPUT_DIR:"
+ls -lh "$OUTPUT_DIR"/BadBuilder-*.exe